Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/fifofs/fifo_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1990, 1993, 1995 3 * The Regents of the University of California. 4 * Copyright (c) 2005 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95 32 * $FreeBSD: releng/6.0/sys/fs/fifofs/fifo_vnops.c 150934 2005-10-04 15:33:06Z rwatson $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/event.h> 37 #include <sys/file.h> 38 #include <sys/filedesc.h> 39 #include <sys/filio.h> 40 #include <sys/fcntl.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/malloc.h> 45 #include <sys/poll.h> 46 #include <sys/proc.h> /* XXXKSE */ 47 #include <sys/signalvar.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/sx.h> 51 #include <sys/systm.h> 52 #include <sys/un.h> 53 #include <sys/unistd.h> 54 #include <sys/vnode.h> 55 #include <fs/fifofs/fifo.h> 56 57 static fo_rdwr_t fifo_read_f; 58 static fo_rdwr_t fifo_write_f; 59 static fo_ioctl_t fifo_ioctl_f; 60 static fo_poll_t fifo_poll_f; 61 static fo_kqfilter_t fifo_kqfilter_f; 62 static fo_stat_t fifo_stat_f; 63 static fo_close_t fifo_close_f; 64 65 struct fileops fifo_ops_f = { 66 .fo_read = fifo_read_f, 67 .fo_write = fifo_write_f, 68 .fo_ioctl = fifo_ioctl_f, 69 .fo_poll = fifo_poll_f, 70 .fo_kqfilter = fifo_kqfilter_f, 71 .fo_stat = fifo_stat_f, 72 .fo_close = fifo_close_f, 73 .fo_flags = DFLAG_PASSABLE 74 }; 75 76 /* 77 * This structure is associated with the FIFO vnode and stores 78 * the state associated with the FIFO. 79 */ 80 struct fifoinfo { 81 struct socket *fi_readsock; 82 struct socket *fi_writesock; 83 long fi_readers; 84 long fi_writers; 85 }; 86 87 static vop_print_t fifo_print; 88 static vop_open_t fifo_open; 89 static vop_close_t fifo_close; 90 static vop_ioctl_t fifo_ioctl; 91 static vop_kqfilter_t fifo_kqfilter; 92 static vop_pathconf_t fifo_pathconf; 93 static vop_advlock_t fifo_advlock; 94 95 static void filt_fifordetach(struct knote *kn); 96 static int filt_fiforead(struct knote *kn, long hint); 97 static void filt_fifowdetach(struct knote *kn); 98 static int filt_fifowrite(struct knote *kn, long hint); 99 static void filt_fifodetach_notsup(struct knote *kn); 100 static int filt_fifo_notsup(struct knote *kn, long hint); 101 102 static struct filterops fiforead_filtops = 103 { 1, NULL, filt_fifordetach, filt_fiforead }; 104 static struct filterops fifowrite_filtops = 105 { 1, NULL, filt_fifowdetach, filt_fifowrite }; 106 static struct filterops fifo_notsup_filtops = 107 { 1, NULL, filt_fifodetach_notsup, filt_fifo_notsup }; 108 109 struct vop_vector fifo_specops = { 110 .vop_default = &default_vnodeops, 111 112 .vop_access = VOP_EBADF, 113 .vop_advlock = fifo_advlock, 114 .vop_close = fifo_close, 115 .vop_create = VOP_PANIC, 116 .vop_getattr = VOP_EBADF, 117 .vop_ioctl = fifo_ioctl, 118 .vop_kqfilter = fifo_kqfilter, 119 .vop_lease = VOP_NULL, 120 .vop_link = VOP_PANIC, 121 .vop_mkdir = VOP_PANIC, 122 .vop_mknod = VOP_PANIC, 123 .vop_open = fifo_open, 124 .vop_pathconf = fifo_pathconf, 125 .vop_print = fifo_print, 126 .vop_read = VOP_PANIC, 127 .vop_readdir = VOP_PANIC, 128 .vop_readlink = VOP_PANIC, 129 .vop_reallocblks = VOP_PANIC, 130 .vop_reclaim = VOP_NULL, 131 .vop_remove = VOP_PANIC, 132 .vop_rename = VOP_PANIC, 133 .vop_rmdir = VOP_PANIC, 134 .vop_setattr = VOP_EBADF, 135 .vop_symlink = VOP_PANIC, 136 .vop_write = VOP_PANIC, 137 }; 138 139 struct mtx fifo_mtx; 140 MTX_SYSINIT(fifo, &fifo_mtx, "fifo mutex", MTX_DEF); 141 142 /* 143 * Dispose of fifo resources. 144 */ 145 static void 146 fifo_cleanup(struct vnode *vp) 147 { 148 struct fifoinfo *fip = vp->v_fifoinfo; 149 150 ASSERT_VOP_LOCKED(vp, "fifo_cleanup"); 151 if (fip->fi_readers == 0 && fip->fi_writers == 0) { 152 vp->v_fifoinfo = NULL; 153 (void)soclose(fip->fi_readsock); 154 (void)soclose(fip->fi_writesock); 155 FREE(fip, M_VNODE); 156 } 157 } 158 159 /* 160 * Open called to set up a new instance of a fifo or 161 * to find an active instance of a fifo. 162 */ 163 /* ARGSUSED */ 164 static int 165 fifo_open(ap) 166 struct vop_open_args /* { 167 struct vnode *a_vp; 168 int a_mode; 169 struct ucred *a_cred; 170 struct thread *a_td; 171 } */ *ap; 172 { 173 struct vnode *vp = ap->a_vp; 174 struct fifoinfo *fip; 175 struct thread *td = ap->a_td; 176 struct ucred *cred = ap->a_cred; 177 struct socket *rso, *wso; 178 struct file *fp; 179 int error; 180 181 ASSERT_VOP_LOCKED(vp, "fifo_open"); 182 if ((fip = vp->v_fifoinfo) == NULL) { 183 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); 184 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, cred, td); 185 if (error) 186 goto fail1; 187 fip->fi_readsock = rso; 188 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, cred, td); 189 if (error) 190 goto fail2; 191 fip->fi_writesock = wso; 192 error = soconnect2(wso, rso); 193 if (error) { 194 (void)soclose(wso); 195 fail2: 196 (void)soclose(rso); 197 fail1: 198 free(fip, M_VNODE); 199 return (error); 200 } 201 fip->fi_readers = fip->fi_writers = 0; 202 wso->so_snd.sb_lowat = PIPE_BUF; 203 SOCKBUF_LOCK(&rso->so_rcv); 204 rso->so_rcv.sb_state |= SBS_CANTRCVMORE; 205 SOCKBUF_UNLOCK(&rso->so_rcv); 206 KASSERT(vp->v_fifoinfo == NULL, 207 ("fifo_open: v_fifoinfo race")); 208 vp->v_fifoinfo = fip; 209 } 210 211 /* 212 * General access to fi_readers and fi_writers is protected using 213 * the vnode lock. 214 * 215 * Protect the increment of fi_readers and fi_writers and the 216 * associated calls to wakeup() with the fifo mutex in addition 217 * to the vnode lock. This allows the vnode lock to be dropped 218 * for the msleep() calls below, and using the fifo mutex with 219 * msleep() prevents the wakeup from being missed. 220 */ 221 mtx_lock(&fifo_mtx); 222 if (ap->a_mode & FREAD) { 223 fip->fi_readers++; 224 if (fip->fi_readers == 1) { 225 SOCKBUF_LOCK(&fip->fi_writesock->so_snd); 226 fip->fi_writesock->so_snd.sb_state &= ~SBS_CANTSENDMORE; 227 SOCKBUF_UNLOCK(&fip->fi_writesock->so_snd); 228 if (fip->fi_writers > 0) { 229 wakeup(&fip->fi_writers); 230 sowwakeup(fip->fi_writesock); 231 } 232 } 233 } 234 if (ap->a_mode & FWRITE) { 235 if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) { 236 mtx_unlock(&fifo_mtx); 237 return (ENXIO); 238 } 239 fip->fi_writers++; 240 if (fip->fi_writers == 1) { 241 SOCKBUF_LOCK(&fip->fi_readsock->so_rcv); 242 fip->fi_readsock->so_rcv.sb_state &= ~SBS_CANTRCVMORE; 243 SOCKBUF_UNLOCK(&fip->fi_readsock->so_rcv); 244 if (fip->fi_readers > 0) { 245 wakeup(&fip->fi_readers); 246 sorwakeup(fip->fi_readsock); 247 } 248 } 249 } 250 if ((ap->a_mode & O_NONBLOCK) == 0) { 251 if ((ap->a_mode & FREAD) && fip->fi_writers == 0) { 252 VOP_UNLOCK(vp, 0, td); 253 error = msleep(&fip->fi_readers, &fifo_mtx, 254 PDROP | PCATCH | PSOCK, "fifoor", 0); 255 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 256 if (error) { 257 fip->fi_readers--; 258 if (fip->fi_readers == 0) { 259 socantsendmore(fip->fi_writesock); 260 fifo_cleanup(vp); 261 } 262 return (error); 263 } 264 mtx_lock(&fifo_mtx); 265 /* 266 * We must have got woken up because we had a writer. 267 * That (and not still having one) is the condition 268 * that we must wait for. 269 */ 270 } 271 if ((ap->a_mode & FWRITE) && fip->fi_readers == 0) { 272 VOP_UNLOCK(vp, 0, td); 273 error = msleep(&fip->fi_writers, &fifo_mtx, 274 PDROP | PCATCH | PSOCK, "fifoow", 0); 275 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 276 if (error) { 277 fip->fi_writers--; 278 if (fip->fi_writers == 0) { 279 socantrcvmore(fip->fi_readsock); 280 fifo_cleanup(vp); 281 } 282 return (error); 283 } 284 /* 285 * We must have got woken up because we had 286 * a reader. That (and not still having one) 287 * is the condition that we must wait for. 288 */ 289 mtx_lock(&fifo_mtx); 290 } 291 } 292 mtx_unlock(&fifo_mtx); 293 KASSERT(ap->a_fdidx >= 0, ("can't fifo/vnode bypass %d", ap->a_fdidx)); 294 fp = ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]; 295 KASSERT(fp->f_ops == &badfileops, ("not badfileops in fifo_open")); 296 fp->f_ops = &fifo_ops_f; 297 fp->f_data = fip; 298 return (0); 299 } 300 301 /* 302 * Now unused vnode ioctl routine. 303 */ 304 /* ARGSUSED */ 305 static int 306 fifo_ioctl(ap) 307 struct vop_ioctl_args /* { 308 struct vnode *a_vp; 309 u_long a_command; 310 caddr_t a_data; 311 int a_fflag; 312 struct ucred *a_cred; 313 struct thread *a_td; 314 } */ *ap; 315 { 316 317 printf("WARNING: fifo_ioctl called unexpectedly\n"); 318 return (ENOTTY); 319 } 320 321 /* 322 * Now unused vnode kqfilter routine. 323 */ 324 /* ARGSUSED */ 325 static int 326 fifo_kqfilter(ap) 327 struct vop_kqfilter_args /* { 328 struct vnode *a_vp; 329 struct knote *a_kn; 330 } */ *ap; 331 { 332 333 printf("WARNING: fifo_kqfilter called unexpectedly\n"); 334 return (EINVAL); 335 } 336 337 static void 338 filt_fifordetach(struct knote *kn) 339 { 340 struct socket *so = (struct socket *)kn->kn_hook; 341 342 SOCKBUF_LOCK(&so->so_rcv); 343 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1); 344 if (knlist_empty(&so->so_rcv.sb_sel.si_note)) 345 so->so_rcv.sb_flags &= ~SB_KNOTE; 346 SOCKBUF_UNLOCK(&so->so_rcv); 347 } 348 349 static int 350 filt_fiforead(struct knote *kn, long hint) 351 { 352 struct socket *so = (struct socket *)kn->kn_hook; 353 354 SOCKBUF_LOCK_ASSERT(&so->so_rcv); 355 kn->kn_data = so->so_rcv.sb_cc; 356 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 357 kn->kn_flags |= EV_EOF; 358 return (1); 359 } else { 360 kn->kn_flags &= ~EV_EOF; 361 return (kn->kn_data > 0); 362 } 363 } 364 365 static void 366 filt_fifowdetach(struct knote *kn) 367 { 368 struct socket *so = (struct socket *)kn->kn_hook; 369 370 SOCKBUF_LOCK(&so->so_snd); 371 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1); 372 if (knlist_empty(&so->so_snd.sb_sel.si_note)) 373 so->so_snd.sb_flags &= ~SB_KNOTE; 374 SOCKBUF_UNLOCK(&so->so_snd); 375 } 376 377 static int 378 filt_fifowrite(struct knote *kn, long hint) 379 { 380 struct socket *so = (struct socket *)kn->kn_hook; 381 382 SOCKBUF_LOCK_ASSERT(&so->so_snd); 383 kn->kn_data = sbspace(&so->so_snd); 384 if (so->so_snd.sb_state & SBS_CANTSENDMORE) { 385 kn->kn_flags |= EV_EOF; 386 return (1); 387 } else { 388 kn->kn_flags &= ~EV_EOF; 389 return (kn->kn_data >= so->so_snd.sb_lowat); 390 } 391 } 392 393 static void 394 filt_fifodetach_notsup(struct knote *kn) 395 { 396 397 } 398 399 static int 400 filt_fifo_notsup(struct knote *kn, long hint) 401 { 402 403 return (0); 404 } 405 406 /* 407 * Device close routine 408 */ 409 /* ARGSUSED */ 410 static int 411 fifo_close(ap) 412 struct vop_close_args /* { 413 struct vnode *a_vp; 414 int a_fflag; 415 struct ucred *a_cred; 416 struct thread *a_td; 417 } */ *ap; 418 { 419 struct vnode *vp = ap->a_vp; 420 struct fifoinfo *fip = vp->v_fifoinfo; 421 422 ASSERT_VOP_LOCKED(vp, "fifo_close"); 423 KASSERT(fip != NULL, ("fifo_close: no v_fifoinfo")); 424 if (ap->a_fflag & FREAD) { 425 fip->fi_readers--; 426 if (fip->fi_readers == 0) 427 socantsendmore(fip->fi_writesock); 428 } 429 if (ap->a_fflag & FWRITE) { 430 fip->fi_writers--; 431 if (fip->fi_writers == 0) 432 socantrcvmore(fip->fi_readsock); 433 } 434 fifo_cleanup(vp); 435 return (0); 436 } 437 438 /* 439 * Print out internal contents of a fifo vnode. 440 */ 441 int 442 fifo_printinfo(vp) 443 struct vnode *vp; 444 { 445 register struct fifoinfo *fip = vp->v_fifoinfo; 446 447 printf(", fifo with %ld readers and %ld writers", 448 fip->fi_readers, fip->fi_writers); 449 return (0); 450 } 451 452 /* 453 * Print out the contents of a fifo vnode. 454 */ 455 static int 456 fifo_print(ap) 457 struct vop_print_args /* { 458 struct vnode *a_vp; 459 } */ *ap; 460 { 461 fifo_printinfo(ap->a_vp); 462 printf("\n"); 463 return (0); 464 } 465 466 /* 467 * Return POSIX pathconf information applicable to fifo's. 468 */ 469 static int 470 fifo_pathconf(ap) 471 struct vop_pathconf_args /* { 472 struct vnode *a_vp; 473 int a_name; 474 int *a_retval; 475 } */ *ap; 476 { 477 478 switch (ap->a_name) { 479 case _PC_LINK_MAX: 480 *ap->a_retval = LINK_MAX; 481 return (0); 482 case _PC_PIPE_BUF: 483 *ap->a_retval = PIPE_BUF; 484 return (0); 485 case _PC_CHOWN_RESTRICTED: 486 *ap->a_retval = 1; 487 return (0); 488 default: 489 return (EINVAL); 490 } 491 /* NOTREACHED */ 492 } 493 494 /* 495 * Fifo advisory byte-level locks. 496 */ 497 /* ARGSUSED */ 498 static int 499 fifo_advlock(ap) 500 struct vop_advlock_args /* { 501 struct vnode *a_vp; 502 caddr_t a_id; 503 int a_op; 504 struct flock *a_fl; 505 int a_flags; 506 } */ *ap; 507 { 508 509 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 510 } 511 512 static int 513 fifo_close_f(struct file *fp, struct thread *td) 514 { 515 516 return (vnops.fo_close(fp, td)); 517 } 518 519 /* 520 * The implementation of ioctl() for named fifos is complicated by the fact 521 * that we permit O_RDWR fifo file descriptors, meaning that the actions of 522 * ioctls may have to be applied to both the underlying sockets rather than 523 * just one. The original implementation simply forward the ioctl to one 524 * or both sockets based on fp->f_flag. We now consider each ioctl 525 * separately, as the composition effect requires careful ordering. 526 * 527 * We do not blindly pass all ioctls through to the socket in order to avoid 528 * providing unnecessary ioctls that might be improperly depended on by 529 * applications (such as socket-specific, routing, and interface ioctls). 530 * 531 * Unlike sys_pipe.c, fifos do not implement the deprecated TIOCSPGRP and 532 * TIOCGPGRP ioctls. Earlier implementations of fifos did forward SIOCSPGRP 533 * and SIOCGPGRP ioctls, so we might need to re-add those here. 534 */ 535 static int 536 fifo_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, 537 struct thread *td) 538 { 539 struct fifoinfo *fi; 540 struct file filetmp; /* Local, so need not be locked. */ 541 int error; 542 543 error = ENOTTY; 544 fi = fp->f_data; 545 546 switch (com) { 547 case FIONBIO: 548 /* 549 * Non-blocking I/O is implemented at the fifo layer using 550 * MSG_NBIO, so does not need to be forwarded down the stack. 551 */ 552 return (0); 553 554 case FIOASYNC: 555 case FIOSETOWN: 556 case FIOGETOWN: 557 /* 558 * These socket ioctls don't have any ordering requirements, 559 * so are called in an arbitrary order, and only on the 560 * sockets indicated by the file descriptor rights. 561 * 562 * XXXRW: If O_RDWR and the read socket accepts an ioctl but 563 * the write socket doesn't, the socketpair is left in an 564 * inconsistent state. 565 */ 566 if (fp->f_flag & FREAD) { 567 filetmp.f_data = fi->fi_readsock; 568 filetmp.f_cred = cred; 569 error = soo_ioctl(&filetmp, com, data, cred, td); 570 if (error) 571 return (error); 572 } 573 if (fp->f_flag & FWRITE) { 574 filetmp.f_data = fi->fi_writesock; 575 filetmp.f_cred = cred; 576 error = soo_ioctl(&filetmp, com, data, cred, td); 577 } 578 return (error); 579 580 case FIONREAD: 581 /* 582 * FIONREAD will return 0 for non-readable descriptors, and 583 * the results of FIONREAD on the read socket for readable 584 * descriptors. 585 */ 586 if (!(fp->f_flag & FREAD)) { 587 *(int *)data = 0; 588 return (0); 589 } 590 filetmp.f_data = fi->fi_readsock; 591 filetmp.f_cred = cred; 592 return (soo_ioctl(&filetmp, com, data, cred, td)); 593 594 default: 595 return (ENOTTY); 596 } 597 } 598 599 /* 600 * Because fifos are now a file descriptor layer object, EVFILT_VNODE is not 601 * implemented. Likely, fifo_kqfilter() should be removed, and 602 * fifo_kqfilter_f() should know how to forward the request to the underling 603 * vnode using f_vnode in the file descriptor here. 604 */ 605 static int 606 fifo_kqfilter_f(struct file *fp, struct knote *kn) 607 { 608 struct fifoinfo *fi; 609 struct socket *so; 610 struct sockbuf *sb; 611 612 fi = fp->f_data; 613 614 /* 615 * If a filter is requested that is not supported by this file 616 * descriptor, don't return an error, but also don't ever generate an 617 * event. 618 */ 619 if ((kn->kn_filter == EVFILT_READ) && !(fp->f_flag & FREAD)) { 620 kn->kn_fop = &fifo_notsup_filtops; 621 return (0); 622 } 623 624 if ((kn->kn_filter == EVFILT_WRITE) && !(fp->f_flag & FWRITE)) { 625 kn->kn_fop = &fifo_notsup_filtops; 626 return (0); 627 } 628 629 switch (kn->kn_filter) { 630 case EVFILT_READ: 631 kn->kn_fop = &fiforead_filtops; 632 so = fi->fi_readsock; 633 sb = &so->so_rcv; 634 break; 635 case EVFILT_WRITE: 636 kn->kn_fop = &fifowrite_filtops; 637 so = fi->fi_writesock; 638 sb = &so->so_snd; 639 break; 640 default: 641 return (EINVAL); 642 } 643 644 kn->kn_hook = (caddr_t)so; 645 646 SOCKBUF_LOCK(sb); 647 knlist_add(&sb->sb_sel.si_note, kn, 1); 648 sb->sb_flags |= SB_KNOTE; 649 SOCKBUF_UNLOCK(sb); 650 651 return (0); 652 } 653 654 static int 655 fifo_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 656 { 657 struct fifoinfo *fip; 658 struct file filetmp; 659 int levents, revents = 0; 660 661 fip = fp->f_data; 662 levents = events & 663 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND); 664 if ((fp->f_flag & FREAD) && levents) { 665 /* 666 * If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is 667 * not, then convert the first two to the last one. This 668 * tells the socket poll function to ignore EOF so that we 669 * block if there is no writer (and no data). Callers can 670 * set POLLINIGNEOF to get non-blocking behavior. 671 */ 672 if (levents & (POLLIN | POLLRDNORM) && 673 !(levents & POLLINIGNEOF)) { 674 levents &= ~(POLLIN | POLLRDNORM); 675 levents |= POLLINIGNEOF; 676 } 677 678 filetmp.f_data = fip->fi_readsock; 679 filetmp.f_cred = cred; 680 revents |= soo_poll(&filetmp, levents, cred, td); 681 682 /* Reverse the above conversion. */ 683 if ((revents & POLLINIGNEOF) && !(events & POLLINIGNEOF)) { 684 revents |= (events & (POLLIN | POLLRDNORM)); 685 revents &= ~POLLINIGNEOF; 686 } 687 } 688 levents = events & (POLLOUT | POLLWRNORM | POLLWRBAND); 689 if ((fp->f_flag & FWRITE) && levents) { 690 filetmp.f_data = fip->fi_writesock; 691 filetmp.f_cred = cred; 692 revents |= soo_poll(&filetmp, levents, cred, td); 693 } 694 return (revents); 695 } 696 697 static int 698 fifo_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 699 { 700 struct fifoinfo *fip; 701 int error, sflags; 702 703 fip = fp->f_data; 704 KASSERT(uio->uio_rw == UIO_READ,("fifo_read mode")); 705 if (uio->uio_resid == 0) 706 return (0); 707 sflags = (fp->f_flag & FNONBLOCK) ? MSG_NBIO : 0; 708 mtx_lock(&Giant); 709 error = soreceive(fip->fi_readsock, NULL, uio, NULL, NULL, &sflags); 710 mtx_unlock(&Giant); 711 return (error); 712 } 713 714 static int 715 fifo_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 716 { 717 718 return (vnops.fo_stat(fp, sb, cred, td)); 719 } 720 721 static int 722 fifo_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 723 { 724 struct fifoinfo *fip; 725 int error, sflags; 726 727 fip = fp->f_data; 728 KASSERT(uio->uio_rw == UIO_WRITE,("fifo_write mode")); 729 sflags = (fp->f_flag & FNONBLOCK) ? MSG_NBIO : 0; 730 mtx_lock(&Giant); 731 error = sosend(fip->fi_writesock, NULL, uio, 0, NULL, sflags, td); 732 mtx_unlock(&Giant); 733 return (error); 734 }
Cache object: d7ee0563c80d5069a43a03b555edbb41
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]